how i can show thumb of photo user on Who's Online??

i want to show photo thumb user on who's online, that's default script for who's online :<strong <?php echo ($User->Invisible == 1 ? 'class="Invisible"' : '')?>><?php echo UserAnchor($User); ?></strong><?php echo Gdn_Format::Date($User->Timestamp); ?>and only show text of name and timestamp, please help me how i can change that script to show photo thumb user like who's online on vanillaforums.org, thx for u're response...